2 * drivers/serial/netx-serial.c
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/config.h>
22 #if defined(CONFIG_SERIAL_NETX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
26 #include <linux/device.h>
27 #include <linux/module.h>
28 #include <linux/ioport.h>
29 #include <linux/init.h>
30 #include <linux/console.h>
31 #include <linux/sysrq.h>
32 #include <linux/platform_device.h>
33 #include <linux/tty.h>
34 #include <linux/tty_flip.h>
35 #include <linux/serial_core.h>
36 #include <linux/serial.h>
40 #include <asm/hardware.h>
41 #include <asm/arch/netx-regs.h>
43 /* We've been assigned a range on the "Low-density serial ports" major */
44 #define SERIAL_NX_MAJOR 204
45 #define MINOR_START 170
47 #ifdef CONFIG_SERIAL_NETX_CONSOLE
53 UART_BAUDDIV_MSB = 0x0c,
54 UART_BAUDDIV_LSB = 0x10,
61 UART_RTS_TRAIL = 0x2c,
62 UART_DRV_ENABLE = 0x30,
64 UART_RXFIFO_IRQLEVEL = 0x38,
65 UART_TXFIFO_IRQLEVEL = 0x3c,
73 #define LINE_CR_BRK (1<<0)
74 #define LINE_CR_PEN (1<<1)
75 #define LINE_CR_EPS (1<<2)
76 #define LINE_CR_STP2 (1<<3)
77 #define LINE_CR_FEN (1<<4)
78 #define LINE_CR_5BIT (0<<5)
79 #define LINE_CR_6BIT (1<<5)
80 #define LINE_CR_7BIT (2<<5)
81 #define LINE_CR_8BIT (3<<5)
82 #define LINE_CR_BITS_MASK (3<<5)
84 #define CR_UART_EN (1<<0)
85 #define CR_SIREN (1<<1)
86 #define CR_SIRLP (1<<2)
87 #define CR_MSIE (1<<3)
90 #define CR_RTIE (1<<6)
96 #define FR_BUSY (1<<3)
97 #define FR_RXFE (1<<4)
98 #define FR_TXFF (1<<5)
99 #define FR_RXFF (1<<6)
100 #define FR_TXFE (1<<7)
102 #define IIR_MIS (1<<0)
103 #define IIR_RIS (1<<1)
104 #define IIR_TIS (1<<2)
105 #define IIR_RTIS (1<<3)
108 #define RTS_CR_AUTO (1<<0)
109 #define RTS_CR_RTS (1<<1)
110 #define RTS_CR_COUNT (1<<2)
111 #define RTS_CR_MOD2 (1<<3)
112 #define RTS_CR_RTS_POL (1<<4)
113 #define RTS_CR_CTS_CTR (1<<5)
114 #define RTS_CR_CTS_POL (1<<6)
115 #define RTS_CR_STICK (1<<7)
117 #define UART_PORT_SIZE 0x40
118 #define DRIVER_NAME "netx-uart"
121 struct uart_port port;
124 static void netx_stop_tx(struct uart_port *port)
127 val = readl(port->membase + UART_CR);
128 writel(val & ~CR_TIE, port->membase + UART_CR);
131 static void netx_stop_rx(struct uart_port *port)
134 val = readl(port->membase + UART_CR);
135 writel(val & ~CR_RIE, port->membase + UART_CR);
138 static void netx_enable_ms(struct uart_port *port)
141 val = readl(port->membase + UART_CR);
142 writel(val | CR_MSIE, port->membase + UART_CR);
145 static inline void netx_transmit_buffer(struct uart_port *port)
147 struct circ_buf *xmit = &port->info->xmit;
150 writel(port->x_char, port->membase + UART_DR);
156 if (uart_tx_stopped(port) || uart_circ_empty(xmit)) {
162 /* send xmit->buf[xmit->tail]
163 * out the port here */
164 writel(xmit->buf[xmit->tail], port->membase + UART_DR);
165 xmit->tail = (xmit->tail + 1) &
166 (UART_XMIT_SIZE - 1);
168 if (uart_circ_empty(xmit))
170 } while (!(readl(port->membase + UART_FR) & FR_TXFF));
172 if (uart_circ_empty(xmit))
176 static void netx_start_tx(struct uart_port *port)
179 readl(port->membase + UART_CR) | CR_TIE, port->membase + UART_CR);
181 if (!(readl(port->membase + UART_FR) & FR_TXFF))
182 netx_transmit_buffer(port);
185 static unsigned int netx_tx_empty(struct uart_port *port)
187 return readl(port->membase + UART_FR) & FR_BUSY ? 0 : TIOCSER_TEMT;
190 static void netx_txint(struct uart_port *port)
192 struct circ_buf *xmit = &port->info->xmit;
194 if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
199 netx_transmit_buffer(port);
201 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
202 uart_write_wakeup(port);
205 static void netx_rxint(struct uart_port *port, struct pt_regs *regs)
207 unsigned char rx, flg, status;
208 struct tty_struct *tty = port->info->tty;
210 while (!(readl(port->membase + UART_FR) & FR_RXFE)) {
211 rx = readl(port->membase + UART_DR);
214 status = readl(port->membase + UART_SR);
215 if (status & SR_BE) {
216 writel(0, port->membase + UART_SR);
217 if (uart_handle_break(port))
221 if (unlikely(status & (SR_FE | SR_PE | SR_OE))) {
224 port->icount.parity++;
225 else if (status & SR_FE)
226 port->icount.frame++;
228 port->icount.overrun++;
230 status &= port->read_status_mask;
234 else if (status & SR_PE)
236 else if (status & SR_FE)
240 if (uart_handle_sysrq_char(port, rx, regs))
243 uart_insert_char(port, status, SR_OE, rx, flg);
246 tty_flip_buffer_push(tty);
250 static irqreturn_t netx_int(int irq, void *dev_id, struct pt_regs *regs)
252 struct uart_port *port = (struct uart_port *)dev_id;
254 unsigned char status;
256 spin_lock_irqsave(&port->lock,flags);
258 status = readl(port->membase + UART_IIR) & IIR_MASK;
260 if (status & IIR_RIS)
261 netx_rxint(port, regs);
262 if (status & IIR_TIS)
264 if (status & IIR_MIS) {
265 if (readl(port->membase + UART_FR) & FR_CTS)
266 uart_handle_cts_change(port, 1);
268 uart_handle_cts_change(port, 0);
270 writel(0, port->membase + UART_IIR);
271 status = readl(port->membase + UART_IIR) & IIR_MASK;
274 spin_unlock_irqrestore(&port->lock,flags);
278 static unsigned int netx_get_mctrl(struct uart_port *port)
280 unsigned int ret = TIOCM_DSR | TIOCM_CAR;
282 if (readl(port->membase + UART_FR) & FR_CTS)
288 static void netx_set_mctrl(struct uart_port *port, unsigned int mctrl)
292 if (mctrl & TIOCM_RTS) {
293 val = readl(port->membase + UART_RTS_CR);
294 writel(val | RTS_CR_RTS, port->membase + UART_RTS_CR);
298 static void netx_break_ctl(struct uart_port *port, int break_state)
300 unsigned int line_cr;
301 spin_lock_irq(&port->lock);
303 line_cr = readl(port->membase + UART_LINE_CR);
304 if (break_state != 0)
305 line_cr |= LINE_CR_BRK;
307 line_cr &= ~LINE_CR_BRK;
308 writel(line_cr, port->membase + UART_LINE_CR);
310 spin_unlock_irq(&port->lock);
313 static int netx_startup(struct uart_port *port)
317 ret = request_irq(port->irq, netx_int, 0,
320 dev_err(port->dev, "unable to grab irq%d\n",port->irq);
324 writel(readl(port->membase + UART_LINE_CR) | LINE_CR_FEN,
325 port->membase + UART_LINE_CR);
327 writel(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE | CR_UART_EN,
328 port->membase + UART_CR);
334 static void netx_shutdown(struct uart_port *port)
336 writel(0, port->membase + UART_CR) ;
338 free_irq(port->irq, port);
342 netx_set_termios(struct uart_port *port, struct termios *termios,
345 unsigned int baud, quot;
346 unsigned char old_cr;
347 unsigned char line_cr = LINE_CR_FEN;
348 unsigned char rts_cr = 0;
350 switch (termios->c_cflag & CSIZE) {
352 line_cr |= LINE_CR_5BIT;
355 line_cr |= LINE_CR_6BIT;
358 line_cr |= LINE_CR_7BIT;
361 line_cr |= LINE_CR_8BIT;
365 if (termios->c_cflag & CSTOPB)
366 line_cr |= LINE_CR_STP2;
368 if (termios->c_cflag & PARENB) {
369 line_cr |= LINE_CR_PEN;
370 if (!(termios->c_cflag & PARODD))
371 line_cr |= LINE_CR_EPS;
374 if (termios->c_cflag & CRTSCTS)
375 rts_cr = RTS_CR_AUTO | RTS_CR_CTS_CTR | RTS_CR_RTS_POL;
377 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
383 spin_lock_irq(&port->lock);
385 uart_update_timeout(port, termios->c_cflag, baud);
387 old_cr = readl(port->membase + UART_CR);
389 /* disable interrupts */
390 writel(old_cr & ~(CR_MSIE | CR_RIE | CR_TIE | CR_RTIE),
391 port->membase + UART_CR);
393 /* drain transmitter */
394 while (readl(port->membase + UART_FR) & FR_BUSY);
397 writel(old_cr & ~CR_UART_EN, port->membase + UART_CR);
399 /* modem status interrupts */
401 if (UART_ENABLE_MS(port, termios->c_cflag))
404 writel((quot>>8) & 0xff, port->membase + UART_BAUDDIV_MSB);
405 writel(quot & 0xff, port->membase + UART_BAUDDIV_LSB);
406 writel(line_cr, port->membase + UART_LINE_CR);
408 writel(rts_cr, port->membase + UART_RTS_CR);
411 * Characters to ignore
413 port->ignore_status_mask = 0;
414 if (termios->c_iflag & IGNPAR)
415 port->ignore_status_mask |= SR_PE;
416 if (termios->c_iflag & IGNBRK) {
417 port->ignore_status_mask |= SR_BE;
419 * If we're ignoring parity and break indicators,
420 * ignore overruns too (for real raw support).
422 if (termios->c_iflag & IGNPAR)
423 port->ignore_status_mask |= SR_PE;
426 port->read_status_mask = 0;
427 if (termios->c_iflag & (BRKINT | PARMRK))
428 port->read_status_mask |= SR_BE;
429 if (termios->c_iflag & INPCK)
430 port->read_status_mask |= SR_PE | SR_FE;
432 writel(old_cr, port->membase + UART_CR);
434 spin_unlock_irq(&port->lock);
437 static const char *netx_type(struct uart_port *port)
439 return port->type == PORT_NETX ? "NETX" : NULL;
442 static void netx_release_port(struct uart_port *port)
444 release_mem_region(port->mapbase, UART_PORT_SIZE);
447 static int netx_request_port(struct uart_port *port)
449 return request_mem_region(port->mapbase, UART_PORT_SIZE,
450 DRIVER_NAME) != NULL ? 0 : -EBUSY;
453 static void netx_config_port(struct uart_port *port, int flags)
455 if (flags & UART_CONFIG_TYPE && netx_request_port(port) == 0)
456 port->type = PORT_NETX;
460 netx_verify_port(struct uart_port *port, struct serial_struct *ser)
464 if (ser->type != PORT_UNKNOWN && ser->type != PORT_NETX)
470 static struct uart_ops netx_pops = {
471 .tx_empty = netx_tx_empty,
472 .set_mctrl = netx_set_mctrl,
473 .get_mctrl = netx_get_mctrl,
474 .stop_tx = netx_stop_tx,
475 .start_tx = netx_start_tx,
476 .stop_rx = netx_stop_rx,
477 .enable_ms = netx_enable_ms,
478 .break_ctl = netx_break_ctl,
479 .startup = netx_startup,
480 .shutdown = netx_shutdown,
481 .set_termios = netx_set_termios,
483 .release_port = netx_release_port,
484 .request_port = netx_request_port,
485 .config_port = netx_config_port,
486 .verify_port = netx_verify_port,
489 static struct netx_port netx_ports[] = {
494 .membase = (char __iomem *)io_p2v(NETX_PA_UART0),
495 .mapbase = NETX_PA_UART0,
496 .irq = NETX_IRQ_UART0,
497 .uartclk = 100000000,
499 .flags = UPF_BOOT_AUTOCONF,
507 .membase = (char __iomem *)io_p2v(NETX_PA_UART1),
508 .mapbase = NETX_PA_UART1,
509 .irq = NETX_IRQ_UART1,
510 .uartclk = 100000000,
512 .flags = UPF_BOOT_AUTOCONF,
520 .membase = (char __iomem *)io_p2v(NETX_PA_UART2),
521 .mapbase = NETX_PA_UART2,
522 .irq = NETX_IRQ_UART2,
523 .uartclk = 100000000,
525 .flags = UPF_BOOT_AUTOCONF,
532 static void netx_console_putchar(struct uart_port *port, int ch)
534 while (readl(port->membase + UART_FR) & FR_BUSY);
535 writel(ch, port->membase + UART_DR);
539 netx_console_write(struct console *co, const char *s, unsigned int count)
541 struct uart_port *port = &netx_ports[co->index].port;
542 unsigned char cr_save;
544 cr_save = readl(port->membase + UART_CR);
545 writel(cr_save | CR_UART_EN, port->membase + UART_CR);
547 uart_console_write(port, s, count, netx_console_putchar);
549 while (readl(port->membase + UART_FR) & FR_BUSY);
550 writel(cr_save, port->membase + UART_CR);
554 netx_console_get_options(struct uart_port *port, int *baud,
555 int *parity, int *bits, int *flow)
557 unsigned char line_cr;
559 *baud = (readl(port->membase + UART_BAUDDIV_MSB) << 8) |
560 readl(port->membase + UART_BAUDDIV_LSB);
567 line_cr = readl(port->membase + UART_LINE_CR);
569 if (line_cr & LINE_CR_PEN) {
570 if (line_cr & LINE_CR_EPS)
576 switch (line_cr & LINE_CR_BITS_MASK) {
591 if (readl(port->membase + UART_RTS_CR) & RTS_CR_AUTO)
596 netx_console_setup(struct console *co, char *options)
598 struct netx_port *sport;
605 * Check whether an invalid uart number has been specified, and
606 * if so, search for the first available port that does have
609 if (co->index == -1 || co->index >= ARRAY_SIZE(netx_ports))
611 sport = &netx_ports[co->index];
614 uart_parse_options(options, &baud, &parity, &bits, &flow);
616 /* if the UART is enabled, assume it has been correctly setup
617 * by the bootloader and get the options
619 if (readl(sport->port.membase + UART_CR) & CR_UART_EN) {
620 netx_console_get_options(&sport->port, &baud,
621 &parity, &bits, &flow);
626 return uart_set_options(&sport->port, co, baud, parity, bits, flow);
629 static struct uart_driver netx_reg;
630 static struct console netx_console = {
632 .write = netx_console_write,
633 .device = uart_console_device,
634 .setup = netx_console_setup,
635 .flags = CON_PRINTBUFFER,
640 static int __init netx_console_init(void)
642 register_console(&netx_console);
645 console_initcall(netx_console_init);
647 #define NETX_CONSOLE &netx_console
649 #define NETX_CONSOLE NULL
652 static struct uart_driver netx_reg = {
653 .owner = THIS_MODULE,
654 .driver_name = DRIVER_NAME,
656 .major = SERIAL_NX_MAJOR,
657 .minor = MINOR_START,
658 .nr = ARRAY_SIZE(netx_ports),
659 .cons = NETX_CONSOLE,
662 static int serial_netx_suspend(struct platform_device *pdev, pm_message_t state)
664 struct netx_port *sport = platform_get_drvdata(pdev);
667 uart_suspend_port(&netx_reg, &sport->port);
672 static int serial_netx_resume(struct platform_device *pdev)
674 struct netx_port *sport = platform_get_drvdata(pdev);
677 uart_resume_port(&netx_reg, &sport->port);
682 static int serial_netx_probe(struct platform_device *pdev)
684 struct uart_port *port = &netx_ports[pdev->id].port;
686 dev_info(&pdev->dev, "initialising\n");
688 port->dev = &pdev->dev;
690 writel(1, port->membase + UART_RXFIFO_IRQLEVEL);
691 uart_add_one_port(&netx_reg, &netx_ports[pdev->id].port);
692 platform_set_drvdata(pdev, &netx_ports[pdev->id]);
697 static int serial_netx_remove(struct platform_device *pdev)
699 struct netx_port *sport = platform_get_drvdata(pdev);
701 platform_set_drvdata(pdev, NULL);
704 uart_remove_one_port(&netx_reg, &sport->port);
709 static struct platform_driver serial_netx_driver = {
710 .probe = serial_netx_probe,
711 .remove = serial_netx_remove,
713 .suspend = serial_netx_suspend,
714 .resume = serial_netx_resume,
721 static int __init netx_serial_init(void)
725 printk(KERN_INFO "Serial: NetX driver\n");
727 ret = uart_register_driver(&netx_reg);
731 ret = platform_driver_register(&serial_netx_driver);
733 uart_unregister_driver(&netx_reg);
738 static void __exit netx_serial_exit(void)
740 platform_driver_unregister(&serial_netx_driver);
741 uart_unregister_driver(&netx_reg);
744 module_init(netx_serial_init);
745 module_exit(netx_serial_exit);
747 MODULE_AUTHOR("Sascha Hauer");
748 MODULE_DESCRIPTION("NetX serial port driver");
749 MODULE_LICENSE("GPL");